SDI 는 MainFrame 에서
MDI 는 CChildFrame  에서 작업한다.


// CChildFrame message handlers
BOOL CChildFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
             // create splitter window
             if (!m_wndSplitter.CreateStatic(this, 1, 2))
                           return FALSE;


             if (!m_wndSplitter.CreateView(0, 0, RUNTIME_CLASS(CMyTreeView), CSize(100, 100), pContext) ||
                         !m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CMyListView), CSize(100, 100), pContext))
            {
                          m_wndSplitter.DestroyWindow();
                          return FALSE;
           }

          return TRUE;

 //       return CMDIChildWnd::OnCreateClient(lpcs, pContext);

}